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The SK hynix HMT42GR7BMR4C-G7 is a 16GB DDR3-1066 PC3-8500R registered ECC DIMM designed for legacy enterprise server and workstation platforms. Featuring a dual-rank x4 (2Rx4) architecture at 1.5V, it delivers dependable memory bandwidth, error checking, and registered signal stability for legacy multi-socket server deployments.
The HMT42GR7BMR4C-G7 is built on SK hynix's 4Gb B-die DRAM process and configured as a dual-rank registered DIMM (2Rx4). The module incorporates thirty-six 4Gb x4 DRAM packages across two physical ranks, providing a 72-bit data bus that includes 64 bits of data alongside 8 bits of sideband ECC for single-bit error correction and multi-bit error detection. It utilizes an onboard Register Clock Driver (RCD) to re-drive command, address, and clock signals, significantly lowering electrical loading on the host memory controller.
Decoding the SK hynix part number shows 'HMT' for SK hynix DDR3 memory, '42G' denoting a 2G x 72 (16GB) module density, 'R7' indicating a standard 240-pin Registered DIMM form factor with 72-bit width, 'B' referencing the B-die silicon revision, 'M' for the package configuration, 'R4' specifying Dual Rank x4 organization, 'C' indicating standard commercial operating temperatures (0°C to 85°C/95°C), and '-G7' representing the DDR3-1066 speed bin with native 7-7-7 CAS latency timings at standard 1.5V VDD.
Always verify against your server's qualified vendor list (QVL).
The HMT42GR7BMR4C-G7 is a standard-voltage 1.5V DDR3 module. While many enterprise servers support both 1.5V and 1.35V DIMMs, mixing them will force the memory bus to operate at 1.5V. It cannot be used in platforms that strictly enforce 1.35V-only operation.
Yes, it can technically be installed alongside faster modules on compatible platforms, but the memory controller will clock all installed DIMMs down to the slowest module's speed (1066 MT/s) and timing parameters. For optimal stability, identical speed and rank configurations are recommended.
No, enterprise systems do not allow mixing different memory types. RDIMMs cannot be combined with unbuffered DIMMs (UDIMMs) or load-reduced DIMMs (LRDIMMs) within the same server.
The HMT42GR7BMR4C-G7 D7 AB is a TAA-compliant enterprise server memory module (nan). Sold as certified refurbished with a 1-year warranty and same-day US shipping when in stock. We stock 7 units of this SKU today.
Compatible with enterprise servers requiring this exact configuration. Bulk orders welcome — quotes typically returned within one business hour. Payment terms: NET-30 for approved accounts, or instant on-chain payment via USDC/ETH on Base or Ethereum for autonomous AI agents and Web3 buyers.